- Added GetAppCookie() and SetAppCookie() functions.
- Fixed Gdn_Request->IsAuthenticatedPostBack() to not require a valid session.
- Added Gdn_Session->EnsureTransientKey.
- Generate a cookie transient key for a user on the signing form so that the sign in is protected against csrf attacks (s12).
Merge branch 'hotfix/2.1a35' of github.com:vanillaforums/Garden into hotfix/2.1a35